US20030218849A1 - Tower type heat sink - Google Patents
Tower type heat sink Download PDFInfo
- Publication number
- US20030218849A1 US20030218849A1 US10/411,281 US41128103A US2003218849A1 US 20030218849 A1 US20030218849 A1 US 20030218849A1 US 41128103 A US41128103 A US 41128103A US 2003218849 A1 US2003218849 A1 US 2003218849A1
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- United States
- Prior art keywords
- heat
- base portion
- heat pipe
- tower type
- heat sink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000005452 bending Methods 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims description 21
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/427—Cooling by change of state, e.g. use of heat pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a Tower Type Heat Sink having a structure in which a heat radiating fins are mounted on a heat transferring portion erected on a base portion.
- heat sinks have a function to enlarge substantial heat radiating area of an exothermic member or a hot section by means of contacting with such exothermic member or hot section. Accordingly, it is sufficient for this kind of heat sinks only to be provided with fins for composing a heat radiating face as many as possible. Also, heat sinks structured with fins arranged on its base member in order to have flexibility for cooling objects are used in a general way. However, there is a disadvantage on the heat sinks having such structure due to difficulty of mounting a number of thin plate shaped heat radiating fins on its base member, namely, the actual heat radiating area of those is limited.
- a tower type heat sink which is structured with erecting a heat transferring member such as braces on its base portion and mounting heat radiating fins on such a heat transferring member, that is, the limitation of mounting numbers of heat radiating fins and the limitation of heat radiating area is reduced, because of its availability of mounting heat radiating fins in consequence of fitting those fins into the heat transferring member and the like.
- An example of this kind of tower type heat sink is disclosed in U.S. Pat. No. 5,412,535, and this heat sink employs a heat pipe or a vapor chamber as said heat transferring member. Namely, a hollow container is erected on the base member and inside of it is employed as a heat pipe, and meanwhile, a plurality of fins is fitted on the outer face of the container.
- fixing part in which fins are not mounted on a part of said heat pipe in order to fix the heat pipe onto the base member.
- a portion of this fixing part is exposed in the vicinity of the face of the base member unavoidably, as the heat sink is assembled.
- This fixing portion is a portion for fixing the heat pipe onto the base member, and also is a portion for transferring a heat to the heat radiating member of the heat sink wherein fins are mounted thereon.
- the fixing part is not a portion to radiate a heat positively, and it is preferable to have a temperature difference against the heat radiating member in order to transfer a heat efficiently from the heating portion to the heat radiating member.
- an object of the present invention is to provide a tower type heat sink which is excellent in heat characteristic and also in productivity.
- a heat pipe for transferring a heat whereby a latent heat of a working fluid encapsulated therein is erected generally vertical on a top face or from a bottom face of a flat plate shaped base portion, and a plurality of heat radiating fins are mounted on said heat pipe.
- This tower type heat sink comprises: a heating portion formed with bending a portion of said heat pipe where the heat radiating fins are not mounted thereon, and a through hole formed on said base portion for letting through said heat pipe to protrude one of its end portion of which said fins are mounted thereon from the top face of said base portion, and to expose the said heating portion on the bottom face of the base portion.
- the exothermic member if the exothermic member is mounted on the face of the base portion where the heating portion of the heat pipe is exposed, the heating portion contacts with the heat pipe directly and heat exchange is generated between them. Moreover, said heating portion to be contacted with the exothermic member is formed with bending an end portion of the heat pipe, and the heat pipe is fixed with the base portion by such heating portion, therefore, fixing part for fixing the heat pipe with the base portion may be formed widely. In consequence, the heat pipe and the base portion can be fixed with each other easily.
- said heating portion is buried in said through hole with having the outer face of said heating portion being flush with the bottom face of the base portion.
- said heating portion is contacted with the exothermic member as a result of that the exothermic member is mounted on the face of the base portion where said heating portion is exposed.
- heat transferring area between the base portion and the heat pipe may be larger since said heating portion is buried in said through hole. Consequently, the heat of the base portion may be transferred to the heat pipe efficiently.
- the face where the heating portion is exposed is an installation face, and the exothermic member is mounted on this installation face.
- the distance between the heating portion and the exothermic member may be shortened, the heat resistance when the heat is transmitted from exothermic member to the heat pipe may be lowered therefore.
- the heat sink according to the present invention can further comprise a curved portion on the heat pipe wherein heat radiating fins are not mounted, in between the heating portion and the end portion with the heat radiating fins mounted thereon.
- a complex installation work of fins may be omitted under such construction; therefore, productivity of the tower type heat sink is improved accordingly.
- a shield wall for surrounding periphery of the part of said curved portion extending towards top face of the base portion may be erected on one of the face of said base portion.
- Said heat pipe may be an L-shaped heat pipe in which one of its end portions is bent generally at right angles.
- said heat pipe may be a U-shaped heat pipe in which both of its end portions are bent generally at a right angles to an intermediate portion.
- the heating portion of the peat pipe may be formed in large, and also, the heat pipe may be fixed on the base portion easily.
- the present invention may be constructed with forming a groove portion for fitting a portion of the heat pipe on one of the face of the base portion, fixing the bent portion of the heat pipe with fitting into a groove or recess, and mounting the fins on the portion extending from the bent portion.
- the bent portion of the heat pipe is a heating portion, and a fastening member may be installed for fixing the heating portion to the base portion.
- Said heating portion of the heat pipe is tightly fixed to the base portion with being pressed, and outer face of said heating portion becomes a heat transferring face entirely. As a result of this, heat resistance is therefore lowered. Also, the heating portion may be fixed tentatively by means of the fastening member and the base portion.
- the tower type heat sink according to the present invention further comprises; a plate for placing the base portion, a fixing member for fixing the base portion with pressing its peripheral portion, and a heat insulating member intervened inbetween the base portion and the fixing member.
- This kind of construction may simplify the structure of the exothermic member or fixing structure of a predetermined plate and the base portion, because the base portion itself does not have a fixing function. Also, heat transfer to the plate under non-contacting states with said exothermic member is prevented because of intervention of a heat insulating layer between the fixing member and the base portion.
- FIG. 1 is an elevation view showing a tower type heat sink according to one embodiment of the invention
- FIG. 2 is an elevation view for showing a heat pipe and a base portion of a tower type heat sink of FIG. 1;
- FIG. 3 is an elevation view showing a tower type heat sink according to another embodiment of the invention.
- FIG. 4 is an elevation view showing a heat pipe and a base portion of a tower type heat sink of FIG. 3;
- FIG. 5 is an elevation view showing a tower type heat sink according to still another embodiment of the invention.
- FIG. 6 is a closeup showing a heat insulating layer of a tower type heat sink of FIG. 5;
- FIG. 7 is an elevation view showing a fixing structure of a heat pipe and a base portion of a tower type heat sink of FIG. 5 simply;
- FIG. 8 is an elevation view showing a shield wall of a tower type heat sink of FIG. 5;
- FIG. 9 is a plane view showing a fin of a tower type heat sink of FIG. 5.
- a tower type heat sink 1 as shown in FIG. 1 is so constructed as to cool an exothermic member 2 such as electric parts or the like.
- a base portion 3 for letting the exothermic member 2 being contacted in a heat exchangeable manner is formed in a flat shape, with a metal having good heat conductivity such as copper or its alloy.
- a through hole 5 for a heat pipe 4 to be mounted therein is formed in the base portion 3 .
- An intermediate portion 6 of the heat pipe 4 is fitted into the through hole 5 , and the intermediate portion 6 is buried inside of the through hole 5 accordingly.
- a bottom face 7 of the intermediate portion 6 and a bottom face of the base portion 3 are so arranged as to be flush with each other.
- Said bottom face 8 exposing the bottom face 7 of the heat pipe 4 is regarded as an installation face 9 .
- a plate 10 is fixed on the rim of the base portion 3 .
- Both of end portions of the heat pipe 4 are bent generally at right angles in the direction to the intermediate portion so as to be formed in a U-shape. And this U-shaped intermediate portion 6 is fixed with the base portion 3 .
- leading end portions 11 such as right and left end portion of the heat pipe 4 .
- fins 12 are flat portions made from aluminum or its alloy and the like, and installation holes 13 are formed thereon.
- Each of fins 12 is fitted with the heat pipe 4 perpendicular to said end portion of the heat pipe 4 , and fixed with the heat pipe 4 by appropriate means such as soldering or caulking.
- those fins 12 are arranged in parallel each other with keeping predetermined distance. Accordingly, a clearance between fins 12 works as an air passage when compulsory cooling is executed by means of not shown fan or the like.
- Fins 12 are not mounted on periphery of a curved portion 14 which connects the intermediate portion 6 and the leading end portion 11 of the heat pipe 4 .
- a curved portion 14 which is not provided fins 12 is arranged on the heat pipe 4 so that the assembling work can be executed with keeping the curved portion 14 sustained. Accordingly, the installation work to mount fins 12 on the heat pipe 4 becomes easier and the productivity of tower type heat sink is improved consequently.
- the fixing part of the heat pipe 4 and base portion 3 are formed widely because the heat pipe 4 is formed into U-shape. Accordingly, the heat pipe 4 and the base portion 3 may be fixed easily.
- the through hole 5 is formed on the base portion 3 according to the tower type heat sink 1 thus far described, however, the through hole of the tower type heat sink according to the present invention is not limited to the construction of the through hole described above.
- said through hole may be a long hole 15 penetrating the base portion 3 in-depth.
- the heat generated on the exothermic member 2 is transmitted to the base portion 3 from the installation face 9 .
- the intermediate portion 6 as a heating portion and the exothermic member 2 are contacted each other almost directly, because the long hole 15 is formed on the base portion 3 , and the bottom face 7 of the intermediate portion 6 and the bottom face of the base portion 3 are so arranged to be flush with each other. Therefore, a heat generated on the exothermic member 2 is transmitted to the heat pipe 4 directly, and the heat resistance is reduced accordingly.
- the intermediate portion 6 of the heat pipe 4 may be inserted into the long hole 15 from the top face of the base portion 3 because the long hole 15 is a long hole penetrating the base portion 3 in-depth.
- the intermediate portion 6 of the heat pipe 4 may be inserted and fixed in the long hole 15 from the top face of the base portion 3 on the occasion of assembling work of the tower type heat sink 1 .
- a tower type heat sink 16 as shown in FIG. 5 is an embodiment of a construction for cooling exothermic member 2 and FIG. 5 is an elevation view showing its overall construction.
- the bottom face of the base portion 3 is an installation face 9 for contacting, or joining the exothermic member 2 in a heat exchangeable manner.
- An installation recess 17 is formed on the top face of the base portion 3 , and one of the end portions of the heat pipe 18 , namely, a base end portion 18 A is fitted in this installation groove 17 .
- the heat pipe 18 as shown in FIG. 5 is a hermetic pipe which works as a container and so bent as to be entirely in L-shape. And its base end portion 18 A in short length is fixed on the base portion 3 as a heating portion.
- An upper cover 19 (namely, a fastening member) covers the part of the base end portion 18 A of the heat pipe 18 protruding from said installation groove 17 and fixed tightly on the top face of the base portion 3 . That is to say, the base end portion 18 A is fixed by the base portion 3 and the upper cover 19 .
- the plastic sheet 20 works as a so-called heat insulting layer between the base portion 3 and the fixing member 21 .
- the fixing member 21 is a member for fixing the plate 22 and made from a material such as aluminum or its alloy.
- the construction of base portion 3 outperforms the fixing member 21 in the heat conductivity so that the heat is increasingly apt to concentrate at the base portion 3 .
- a plurality of fins 12 is mounted on the leading end portion 18 B i.e., the other end portion of said L-shape of the heat pipe 18 , and works as a heat radiating portion.
- These fins 12 are thin plate portions made from metal such as aluminum or its alloy.
- the fins 12 are not mounted in the periphery of said L-shaped curved portion 4 of the heat pipe 18 , and a shield wall 24 is erected on the base portion 3 for surrounding the curved portion 4 of the heat pipe 18 .
- the shield wall 24 is so erected on the top face of the base portion 3 for defilading rest of the portion except the air passage in the air streaming direction of the fins 12 , in case of sending air by means of not shown fan or the like.
- the plastic sheet 20 interposed in between the base portion 3 and the fixing member 21 functions as a heat insulating layer, so that the heat conducting from the base portion 3 to the plate 22 via the fixing member 21 is prevented.
- the base portion 3 itself does not have a fixing function, so that the structure of the exothermic member 2 and the fixing structure between the predetermined plate 22 and the base portion 3 becomes simple.
- the heat of the base portion 3 is transmitted to the base end portion 18 A, and the heat transmitted to the base end portion 18 A is transferred to a heat radiating portion by the heat pipe 18 . Then, the heat transferred to the heat radiating portion is diffused outward from the wide face of the fins 12 .
- the base end portion 18 A of the heat pipe 18 , or the exposed curved portion 14 , other than the heat radiating portion is defiladed from said air stream by the shield wall 24 erected on the base portion 3 . Therefore, said air stream is prevented from making a detour to avoid the fins 12 . In other words, even if the fins 12 are arranged closely to the heat pipe 18 , it is easy for the blown air to pass through the fins 12 and preferable heat radiating effect may be obtained.
- the plastic sheet 20 is so interposed as a heat insulating layer between the base portion 3 and the fixing member 21 , so that most of the heat conducted to the base portion 3 is conducted to the intermediate portion 6 without being diffused on the base portion 3 . Accordingly, temperature drop caused by said diffusion may be decreased and the periphery of the intermediate portion 6 may also be kept in high temperature. If the periphery of the intermediate portion 6 is kept in high temperature, ebullition and evaporation of the working fluid in the heat pipe 18 may be executed efficiently. Consequently, heat transferring efficiency of the heat pipe 18 may be improved, that is, heat radiating capacity of the heat sink 16 is improved. Hence, the necessity for providing a cover or the like on the fixing member 21 for protecting the plate 22 from the heat may be omitted. Accordingly, productivity of the tower type heat sink 16 is improved.
- the base portion 3 is formed with a material having better heat conductivity as compared with the fixing member 21 . Accordingly, most of the heat conducted from the exothermic member 2 to the base portion 3 may be transmitted to the base end portion 18 A of the heat pipe 18 , so that the heat generated on the exothermic member 2 may be transferred to the heat radiating portion efficiently. As a result, heat radiating capacity may be improved.
- the tower type heat sink 16 of the embodiment described above is not limited in the shape and number of the above mentioned heat pipe.
- a heat pipe, which is bent in U-shape may also be employed and constructed with fixing its intermediate portion on the base portion.
- the curved portion 14 of the heat pipe 18 is defiladed from the air stream by the shield wall 24 , however, the construction of this shield wall is not limited in the construction of the above mentioned shield wall 24 on the other hand.
- the periphery of each heat pipe 18 may be covered with a film portion in order to defilade from the said air stream. The point is, it is sufficient for the portion where the fins of the heat pipe are not arranged to be defiladed from the air stream, and the material and the shape of the shield wall is not limited in particular.
- the present invention is so constructed as to fix the base portion with the heat pipes erected thereon to the plate with the fixing portion. Therefore, according to the present invention, the base portion may be downsized within the size the exothermic member may be mounted. Accordingly, it is possible to be constructed with the base portion made from a metal having preferable heat conductivity, and the fixing member made from inexpensive material. For instance, the base portion may be made from copper, and the fixing member may be made from aluminum. In consequence, the entire cost of the heat pipe may be curbed cheaper. In such case, it is unnecessary for said heat insulating layer to be interposed, and also, it is possible for the exothermic member to be contacted with the plate, e.g., to be installed on the plate.
- both of the heat resistances, such as between the base portion and the heat pipe, and between the exothermic member and the heat pipe may be reduced and therefore the heat pipe having an excellent heat radiating characteristic may be obtained; because, it is constructed with bending the leading end portion or the intermediate portion of the heat pipe generally at right angles, and fixing to the flat plat shaped base portion with exposing this bent part on the bottom face of the base portion in order to contact or to join the exothermic member with the exposing part in a heat exchangeable manner.
- the heat pipe and the base portion may be joined easily and certainly because the joining dimension is wide.
- fins are not mounted on the curved portion of the heat pipe so that the complex installation work may be omitted.
- productivity of the heat pipe may be improved.
- it is constructed so as to surround the curved portion with no fins mounted thereon by the shield wall, detouring of cooling air to avoid the fins may be restricted. Namely, the heat radiating efficiency may be improved with leading the cooling air in a positive manner.
- it is structured with bending the heat pipe in a U-shape, fitting its intermediate portion into the installation groove formed on the base portion, and fixing the intermediate portion against the base portion with the fastening member, the productivity of the heat sink will be improved.
- the base portion having such structure is constructed so as to be fixed to the plate by the fixing portion with interposing the heat insulating member between the fixing member, the heat may be radiated more positively by means of the heat pipe and fins mounted thereon, and the heat radiating characteristic of the entire heat sink may be improved as a result. Furthermore, the structure of the base portion, or exothermic member to be contacted thereon may be simplified.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a Tower Type Heat Sink having a structure in which a heat radiating fins are mounted on a heat transferring portion erected on a base portion.
- 2. Related Art
- In general, heat sinks have a function to enlarge substantial heat radiating area of an exothermic member or a hot section by means of contacting with such exothermic member or hot section. Accordingly, it is sufficient for this kind of heat sinks only to be provided with fins for composing a heat radiating face as many as possible. Also, heat sinks structured with fins arranged on its base member in order to have flexibility for cooling objects are used in a general way. However, there is a disadvantage on the heat sinks having such structure due to difficulty of mounting a number of thin plate shaped heat radiating fins on its base member, namely, the actual heat radiating area of those is limited.
- On the other hand, there is an advantage on a tower type heat sink which is structured with erecting a heat transferring member such as braces on its base portion and mounting heat radiating fins on such a heat transferring member, that is, the limitation of mounting numbers of heat radiating fins and the limitation of heat radiating area is reduced, because of its availability of mounting heat radiating fins in consequence of fitting those fins into the heat transferring member and the like. An example of this kind of tower type heat sink is disclosed in U.S. Pat. No. 5,412,535, and this heat sink employs a heat pipe or a vapor chamber as said heat transferring member. Namely, a hollow container is erected on the base member and inside of it is employed as a heat pipe, and meanwhile, a plurality of fins is fitted on the outer face of the container.
- In the above mentioned heat pipe in the prior art, heat resistance on the part from the base member to the heat radiating fins may be reduced, because the trapezoidal heat pipe or the vapor chamber mediates heat transfer from the base portion to the fins, and furthermore, the heat transfer is executed by a latent heat of a working fluid. In the tower type heat sink having such structure, the heat pipe with fins mounted thereon has to also have a function as a brace for a plurality of fins to be mounted; therefore, the heat pipe and the base member must be fixed integrally. Consequently, there is a disadvantage in productivity due to the complexity of its fixing structure between the heat pipe and the base member.
- Moreover, in the tower type heat sink as described hereinbefore, it is necessary to form so-called fixing part, in which fins are not mounted on a part of said heat pipe in order to fix the heat pipe onto the base member. A portion of this fixing part is exposed in the vicinity of the face of the base member unavoidably, as the heat sink is assembled. This fixing portion is a portion for fixing the heat pipe onto the base member, and also is a portion for transferring a heat to the heat radiating member of the heat sink wherein fins are mounted thereon. Accordingly, the fixing part is not a portion to radiate a heat positively, and it is preferable to have a temperature difference against the heat radiating member in order to transfer a heat efficiently from the heating portion to the heat radiating member.
- However, in case of sending air to said tower type heat sink by a fan or the like for compulsory cooling purpose, the air stream towards not only the heat radiating member, but also the fixing part exposed from said base portion preferentially. Because, resistance of fluidity of the fins at the heat radiating member is higher than the resistance of fluidity at the fixing part. In consequence, heat transfer cannot be executed efficiently and cooling performance of the tower type heat sink is deteriorated disadvantageously.
- The present invention has been conceived with a view to solve the above described technical problems. In other words, an object of the present invention is to provide a tower type heat sink which is excellent in heat characteristic and also in productivity.
- According to the heat sink of the present invention, a heat pipe for transferring a heat whereby a latent heat of a working fluid encapsulated therein is erected generally vertical on a top face or from a bottom face of a flat plate shaped base portion, and a plurality of heat radiating fins are mounted on said heat pipe. This tower type heat sink comprises: a heating portion formed with bending a portion of said heat pipe where the heat radiating fins are not mounted thereon, and a through hole formed on said base portion for letting through said heat pipe to protrude one of its end portion of which said fins are mounted thereon from the top face of said base portion, and to expose the said heating portion on the bottom face of the base portion.
- Accordingly, in the tower type heat sink according to the present invention, if the exothermic member is mounted on the face of the base portion where the heating portion of the heat pipe is exposed, the heating portion contacts with the heat pipe directly and heat exchange is generated between them. Moreover, said heating portion to be contacted with the exothermic member is formed with bending an end portion of the heat pipe, and the heat pipe is fixed with the base portion by such heating portion, therefore, fixing part for fixing the heat pipe with the base portion may be formed widely. In consequence, the heat pipe and the base portion can be fixed with each other easily.
- Furthermore, in the tower type heat sink according to the present invention, said heating portion is buried in said through hole with having the outer face of said heating portion being flush with the bottom face of the base portion.
- Therefore, in such construction, said heating portion is contacted with the exothermic member as a result of that the exothermic member is mounted on the face of the base portion where said heating portion is exposed. Also, heat transferring area between the base portion and the heat pipe may be larger since said heating portion is buried in said through hole. Consequently, the heat of the base portion may be transferred to the heat pipe efficiently.
- Furthermore, in the heat pipe according to the present invention, the face where the heating portion is exposed is an installation face, and the exothermic member is mounted on this installation face. Hence the distance between the heating portion and the exothermic member may be shortened, the heat resistance when the heat is transmitted from exothermic member to the heat pipe may be lowered therefore.
- Additionally, the heat sink according to the present invention can further comprise a curved portion on the heat pipe wherein heat radiating fins are not mounted, in between the heating portion and the end portion with the heat radiating fins mounted thereon.
- A complex installation work of fins may be omitted under such construction; therefore, productivity of the tower type heat sink is improved accordingly.
- And according to the present invention, a shield wall for surrounding periphery of the part of said curved portion extending towards top face of the base portion may be erected on one of the face of said base portion.
- Because the curved portion of the heat pipe is defiladed by the shield wall from blown air, an air stream is therefore prevented from detouring to avoid fins. Namely, heat dissipation capacity is improved since the air stream passes though fins without fail.
- Said heat pipe may be an L-shaped heat pipe in which one of its end portions is bent generally at right angles.
- Also, said heat pipe may be a U-shaped heat pipe in which both of its end portions are bent generally at a right angles to an intermediate portion.
- Accordingly, in consequence of employing a heat pipe in such shapes, the heating portion of the peat pipe may be formed in large, and also, the heat pipe may be fixed on the base portion easily.
- On the other hand, the present invention may be constructed with forming a groove portion for fitting a portion of the heat pipe on one of the face of the base portion, fixing the bent portion of the heat pipe with fitting into a groove or recess, and mounting the fins on the portion extending from the bent portion.
- The bent portion of the heat pipe is a heating portion, and a fastening member may be installed for fixing the heating portion to the base portion.
- Said heating portion of the heat pipe is tightly fixed to the base portion with being pressed, and outer face of said heating portion becomes a heat transferring face entirely. As a result of this, heat resistance is therefore lowered. Also, the heating portion may be fixed tentatively by means of the fastening member and the base portion.
- The tower type heat sink according to the present invention further comprises; a plate for placing the base portion, a fixing member for fixing the base portion with pressing its peripheral portion, and a heat insulating member intervened inbetween the base portion and the fixing member.
- This kind of construction may simplify the structure of the exothermic member or fixing structure of a predetermined plate and the base portion, because the base portion itself does not have a fixing function. Also, heat transfer to the plate under non-contacting states with said exothermic member is prevented because of intervention of a heat insulating layer between the fixing member and the base portion.
- The above and further objects and novel features of the invention will more fully appear from the following detailed description when the same is read with reference to the accompany drawings. It is to be expressly understood, however, that the drawings are for purpose of illustration only and are not intended as a definition of the limits of the invention.
- FIG. 1 is an elevation view showing a tower type heat sink according to one embodiment of the invention;
- FIG. 2 is an elevation view for showing a heat pipe and a base portion of a tower type heat sink of FIG. 1;
- FIG. 3 is an elevation view showing a tower type heat sink according to another embodiment of the invention;
- FIG. 4 is an elevation view showing a heat pipe and a base portion of a tower type heat sink of FIG. 3;
- FIG. 5 is an elevation view showing a tower type heat sink according to still another embodiment of the invention;
- FIG. 6 is a closeup showing a heat insulating layer of a tower type heat sink of FIG. 5;
- FIG. 7 is an elevation view showing a fixing structure of a heat pipe and a base portion of a tower type heat sink of FIG. 5 simply;
- FIG. 8 is an elevation view showing a shield wall of a tower type heat sink of FIG. 5; and
- FIG. 9 is a plane view showing a fin of a tower type heat sink of FIG. 5.
- Specific embodiments of the invention will be described with reference to the accompanying drawings. A tower
type heat sink 1 as shown in FIG. 1 is so constructed as to cool anexothermic member 2 such as electric parts or the like. In this embodiment, abase portion 3 for letting theexothermic member 2 being contacted in a heat exchangeable manner is formed in a flat shape, with a metal having good heat conductivity such as copper or its alloy. In thebase portion 3, there is formed a throughhole 5 for aheat pipe 4 to be mounted therein. Anintermediate portion 6 of theheat pipe 4 is fitted into the throughhole 5, and theintermediate portion 6 is buried inside of the throughhole 5 accordingly. Also, abottom face 7 of theintermediate portion 6 and a bottom face of thebase portion 3 are so arranged as to be flush with each other. Saidbottom face 8 exposing thebottom face 7 of theheat pipe 4 is regarded as an installation face 9. And aplate 10 is fixed on the rim of thebase portion 3. - Both of end portions of the
heat pipe 4 are bent generally at right angles in the direction to the intermediate portion so as to be formed in a U-shape. And this U-shapedintermediate portion 6 is fixed with thebase portion 3. - On both of leading
end portions 11, such as right and left end portion of theheat pipe 4, there are mounted a plurality offins 12 for heat radiating purpose, and those are regarded as a heat radiating portion.Fins 12 are flat portions made from aluminum or its alloy and the like, and installation holes 13 are formed thereon. Each offins 12 is fitted with theheat pipe 4 perpendicular to said end portion of theheat pipe 4, and fixed with theheat pipe 4 by appropriate means such as soldering or caulking. And thosefins 12 are arranged in parallel each other with keeping predetermined distance. Accordingly, a clearance betweenfins 12 works as an air passage when compulsory cooling is executed by means of not shown fan or the like. -
Fins 12 are not mounted on periphery of acurved portion 14 which connects theintermediate portion 6 and theleading end portion 11 of theheat pipe 4. - Next, action of the aforementioned heat sink will be described hereafter. First of all, a heat generated on the
exothermic member 2 is transmitted to thebase portion 3 from the installation face 9. In thebase portion 3, thebottom face 7 of theintermediate portion 6 of theheat pipe 4 and thebottom face 8 of thebase portion 3 are so arranged to be flush with each other; therefore, theintermediate portion 6 as a heating portion and theexothermic member 2 are contacted with each other almost directly. Hence, the heat generated on theexothermic member 2 is transmitted to theheat pipe 4 directly and heat resistance is reduced consequently. Also, theintermediate portion 6 of theheat pipe 4 is buried in the throughhole 5 formed on thebase portion 3, and a heat conducting area becomes larger accordingly. Therefore, the heat on thebase portion 3 is transmitted to theheat pipe 4 efficiently and transferred to thefins 12. - Additionally, a
curved portion 14 which is not providedfins 12 is arranged on theheat pipe 4 so that the assembling work can be executed with keeping thecurved portion 14 sustained. Accordingly, the installation work to mountfins 12 on theheat pipe 4 becomes easier and the productivity of tower type heat sink is improved consequently. - Moreover, the fixing part of the
heat pipe 4 andbase portion 3 are formed widely because theheat pipe 4 is formed into U-shape. Accordingly, theheat pipe 4 and thebase portion 3 may be fixed easily. - Besides, the through
hole 5 is formed on thebase portion 3 according to the towertype heat sink 1 thus far described, however, the through hole of the tower type heat sink according to the present invention is not limited to the construction of the through hole described above. For instance, as shown in FIG. 3 and FIG. 4, said through hole may be along hole 15 penetrating thebase portion 3 in-depth. - If in the case that the through hole formed on the
base portion 3 is the long hole, the heat generated on theexothermic member 2 is transmitted to thebase portion 3 from the installation face 9. Theintermediate portion 6 as a heating portion and theexothermic member 2 are contacted each other almost directly, because thelong hole 15 is formed on thebase portion 3, and thebottom face 7 of theintermediate portion 6 and the bottom face of thebase portion 3 are so arranged to be flush with each other. Therefore, a heat generated on theexothermic member 2 is transmitted to theheat pipe 4 directly, and the heat resistance is reduced accordingly. Also, theintermediate portion 6 of theheat pipe 4 may be inserted into thelong hole 15 from the top face of thebase portion 3 because thelong hole 15 is a long hole penetrating thebase portion 3 in-depth. - Accordingly, if in the case that the through hole of the
base portion 3 of the towertype heat sink 1 is thelong hole 15, theintermediate portion 6 of theheat pipe 4 may be inserted and fixed in thelong hole 15 from the top face of thebase portion 3 on the occasion of assembling work of the towertype heat sink 1. - Next, another embodiment of the invention will be described hereinafter. However, explanation for the construction equivalent to, or identical to the embodiment mentioned above will be omitted with providing same referential numerals. A tower
type heat sink 16 as shown in FIG. 5 is an embodiment of a construction for coolingexothermic member 2 and FIG. 5 is an elevation view showing its overall construction. In the embodiment as depicted in FIG. 5, the bottom face of thebase portion 3 is an installation face 9 for contacting, or joining theexothermic member 2 in a heat exchangeable manner. - An
installation recess 17 is formed on the top face of thebase portion 3, and one of the end portions of theheat pipe 18, namely, abase end portion 18A is fitted in thisinstallation groove 17. Theheat pipe 18 as shown in FIG. 5 is a hermetic pipe which works as a container and so bent as to be entirely in L-shape. And itsbase end portion 18 A in short length is fixed on thebase portion 3 as a heating portion. An upper cover 19 (namely, a fastening member) covers the part of thebase end portion 18A of theheat pipe 18 protruding from saidinstallation groove 17 and fixed tightly on the top face of thebase portion 3. That is to say, thebase end portion 18A is fixed by thebase portion 3 and theupper cover 19. - In the periphery of the
base portion 3, there is mounted a fixingmember 21 with aplastic sheet 20 formed from the material having low heat conductivity such as plastic is being interposed therebetween. Accordingly, theplastic sheet 20 works as a so-called heat insulting layer between thebase portion 3 and the fixingmember 21. - The fixing
member 21 is a member for fixing theplate 22 and made from a material such as aluminum or its alloy. The construction ofbase portion 3 outperforms the fixingmember 21 in the heat conductivity so that the heat is increasingly apt to concentrate at thebase portion 3. - Moreover, a plurality of
fins 12 is mounted on theleading end portion 18B i.e., the other end portion of said L-shape of theheat pipe 18, and works as a heat radiating portion. Thesefins 12 are thin plate portions made from metal such as aluminum or its alloy. - There are three of said
heat pipes 18 provided andleading end portions 18B of thoseheat pipes 18 are so arranged to form triangle and located in each corner, as depicted in FIG. 9. On the other hand, there are three of installation holes 23 formed in eachfins 12 for fitting theleading end portions 18B of theheat pipes 18 therein. The installation state of eachfin 12 against theheat pipes 18 is same as the state of the heat sink described above and shown in FIG. 1. - The
fins 12 are not mounted in the periphery of said L-shapedcurved portion 4 of theheat pipe 18, and ashield wall 24 is erected on thebase portion 3 for surrounding thecurved portion 4 of theheat pipe 18. In other words, theshield wall 24 is so erected on the top face of thebase portion 3 for defilading rest of the portion except the air passage in the air streaming direction of thefins 12, in case of sending air by means of not shown fan or the like. - The action of above mentioned tower
type heat sink 16 will be described hereafter. First of all, mount theexothermic member 2 onto the towertype heat sink 16. At this step, theexothermic member 2 contacts with thebase portion 3. Then, a heat is generated by the operation of theexothermic member 2, and the heat is transmitted to thebase portion 3. On thebase portion 3, a plurality ofbase end portions 18A of pipe shapedheat pipe 18 is embedded and fixed in theinstallation recess 17 of thebase portion 3, therefore, the heat transmitting area between theheat pipe 18 and thebase portion 3 becomes larger. Accordingly, the heat on thebase portion 3 is transmitted to theheat pipe 18 efficiently and transported to thefins 12. - Moreover, since the
base end portion 18A of theheat pipe 18 is fixed by thebase portion 3 and theupper cover 19, entire outer face of thebase end portion 18A functions as a heat conducting face to thebase portion 3 and the heat resistance becomes therefore lower. Consequently, the heat generated on theexothermic member 2 is transported to thefins 12 efficiently. - Furthermore, the
plastic sheet 20 interposed in between thebase portion 3 and the fixingmember 21 functions as a heat insulating layer, so that the heat conducting from thebase portion 3 to theplate 22 via the fixingmember 21 is prevented. - Because of the
leading end portions 18B of saidheat pipe 18 are arranged in the triangle formation, the construction of theheat pipe 18,fins 12, and thebase portion 3 becomes so-called truss structure and rigidity of the tower type heat sink is therefore improved. - Moreover, the
base portion 3 itself does not have a fixing function, so that the structure of theexothermic member 2 and the fixing structure between thepredetermined plate 22 and thebase portion 3 becomes simple. - Furthermore, the heat of the
base portion 3 is transmitted to thebase end portion 18A, and the heat transmitted to thebase end portion 18A is transferred to a heat radiating portion by theheat pipe 18. Then, the heat transferred to the heat radiating portion is diffused outward from the wide face of thefins 12. - On this occasion, the
base end portion 18A of theheat pipe 18, or the exposedcurved portion 14, other than the heat radiating portion is defiladed from said air stream by theshield wall 24 erected on thebase portion 3. Therefore, said air stream is prevented from making a detour to avoid thefins 12. In other words, even if thefins 12 are arranged closely to theheat pipe 18, it is easy for the blown air to pass through thefins 12 and preferable heat radiating effect may be obtained. - Besides, since the
upper cover 19 is fixed tightly on the top face of thebase portion 3 in the construction mentioned above, entire outer face of thebase end portion 18A of saidheat pipe 18 functions as a heat conducting face to thebase portion 3, and heat resistance becomes lower accordingly. As a result, the heat characteristic may be improved. - Also, the
plastic sheet 20 is so interposed as a heat insulating layer between thebase portion 3 and the fixingmember 21, so that most of the heat conducted to thebase portion 3 is conducted to theintermediate portion 6 without being diffused on thebase portion 3. Accordingly, temperature drop caused by said diffusion may be decreased and the periphery of theintermediate portion 6 may also be kept in high temperature. If the periphery of theintermediate portion 6 is kept in high temperature, ebullition and evaporation of the working fluid in theheat pipe 18 may be executed efficiently. Consequently, heat transferring efficiency of theheat pipe 18 may be improved, that is, heat radiating capacity of theheat sink 16 is improved. Hence, the necessity for providing a cover or the like on the fixingmember 21 for protecting theplate 22 from the heat may be omitted. Accordingly, productivity of the towertype heat sink 16 is improved. - Moreover, in the
heat sink 16 as depicted in FIG. 5, thebase portion 3 is formed with a material having better heat conductivity as compared with the fixingmember 21. Accordingly, most of the heat conducted from theexothermic member 2 to thebase portion 3 may be transmitted to thebase end portion 18A of theheat pipe 18, so that the heat generated on theexothermic member 2 may be transferred to the heat radiating portion efficiently. As a result, heat radiating capacity may be improved. - Besides, three of
heat pipes 18 bent in L-shape are employed in the towertype heat sink 16 of the embodiment described above, however, the tower type heat sink according to the invention is not limited in the shape and number of the above mentioned heat pipe. For example, a heat pipe, which is bent in U-shape may also be employed and constructed with fixing its intermediate portion on the base portion. - Furthermore, in the tower
type heat sink 16 as described in the above embodiment, thecurved portion 14 of theheat pipe 18 is defiladed from the air stream by theshield wall 24, however, the construction of this shield wall is not limited in the construction of the above mentionedshield wall 24 on the other hand. For example, the periphery of eachheat pipe 18 may be covered with a film portion in order to defilade from the said air stream. The point is, it is sufficient for the portion where the fins of the heat pipe are not arranged to be defiladed from the air stream, and the material and the shape of the shield wall is not limited in particular. - Meanwhile, the present invention is so constructed as to fix the base portion with the heat pipes erected thereon to the plate with the fixing portion. Therefore, according to the present invention, the base portion may be downsized within the size the exothermic member may be mounted. Accordingly, it is possible to be constructed with the base portion made from a metal having preferable heat conductivity, and the fixing member made from inexpensive material. For instance, the base portion may be made from copper, and the fixing member may be made from aluminum. In consequence, the entire cost of the heat pipe may be curbed cheaper. In such case, it is unnecessary for said heat insulating layer to be interposed, and also, it is possible for the exothermic member to be contacted with the plate, e.g., to be installed on the plate.
- The advantages which may be obtained from the present invention will be described conclusively hereinafter. According to the invention, both of the heat resistances, such as between the base portion and the heat pipe, and between the exothermic member and the heat pipe may be reduced and therefore the heat pipe having an excellent heat radiating characteristic may be obtained; because, it is constructed with bending the leading end portion or the intermediate portion of the heat pipe generally at right angles, and fixing to the flat plat shaped base portion with exposing this bent part on the bottom face of the base portion in order to contact or to join the exothermic member with the exposing part in a heat exchangeable manner. Moreover, the heat pipe and the base portion may be joined easily and certainly because the joining dimension is wide.
- Besides, according to the invention, fins are not mounted on the curved portion of the heat pipe so that the complex installation work may be omitted. As a result, productivity of the heat pipe may be improved. If it is constructed so as to surround the curved portion with no fins mounted thereon by the shield wall, detouring of cooling air to avoid the fins may be restricted. Namely, the heat radiating efficiency may be improved with leading the cooling air in a positive manner. Furthermore, if it is structured with bending the heat pipe in a U-shape, fitting its intermediate portion into the installation groove formed on the base portion, and fixing the intermediate portion against the base portion with the fastening member, the productivity of the heat sink will be improved. If the base portion having such structure is constructed so as to be fixed to the plate by the fixing portion with interposing the heat insulating member between the fixing member, the heat may be radiated more positively by means of the heat pipe and fins mounted thereon, and the heat radiating characteristic of the entire heat sink may be improved as a result. Furthermore, the structure of the base portion, or exothermic member to be contacted thereon may be simplified.
Claims (13)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2002112748A JP3819316B2 (en) | 2002-04-15 | 2002-04-15 | Tower type heat sink |
JP2002-112748 | 2002-04-15 | ||
JP2002224959A JP3929374B2 (en) | 2002-08-01 | 2002-08-01 | Tower type heat sink |
JP2002-224959 | 2002-08-01 |
Publications (2)
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US20030218849A1 true US20030218849A1 (en) | 2003-11-27 |
US7165603B2 US7165603B2 (en) | 2007-01-23 |
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Application Number | Title | Priority Date | Filing Date |
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US10/411,281 Expired - Fee Related US7165603B2 (en) | 2002-04-15 | 2003-04-11 | Tower type heat sink |
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US (1) | US7165603B2 (en) |
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DE102019133187A1 (en) * | 2019-12-05 | 2021-06-10 | Avl Software And Functions Gmbh | Device for cooling at least one heat-generating electronic component |
DE102019133206B4 (en) | 2019-12-05 | 2022-05-25 | Avl Software And Functions Gmbh | Device for cooling at least one heat-generating electronic component and plug-in element |
DE102019133187B4 (en) | 2019-12-05 | 2022-12-08 | Avl Software And Functions Gmbh | Device for cooling at least one heat-generating electronic component |
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